uppose that a stock exchange (market) uses a relational database to store data on stocks and the brokers who own them. Assume that numerous sales of stocks may take place concurrently between different pairs of brokers.         (a)    Describe the properties that transactions must have.          (b)   Discuss the extent to which a database management system alone can ensure that the stock market’s database remains in a consistent state. Illustrate your answer using the sale of some stock. (c) What are the benefits to the stock market of using a database management system to support concurrent transactions?

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